Longueuil weather
Loading live data…Light drizzle,much the same tomorrow
Env. Canada, the European and the American model put Longueuil's high today between 22° and 25°, a 3° split. Tomorrow looks cloudy around 25°, with a 10% chance of rain.
The weather map: all three models at once
Env. Canada, European, American side by side around Longueuil and nearby towns.Live rain radar →Next 14 hours
consensus of the three models14-day forecast
where the models agree, and where they splitLongueuil, Quebec. Below we compare what Env. Canada, European, American forecast for Longueuil right now and flag exactly where they disagree, then break down Longueuil's weather month by month and which forecast model has been most accurate here.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in Canada before you trust any single number.
Longueuil weather by month
what to expect in Longueuil through the yearHere is Longueuil's typical weather in each month: the average daytime high and overnight low in °C, how each month feels, and the wettest month marked. Use it to plan any trip to Longueuil by season.
What Longueuil's weather is like through the year
Longueuil runs from warm summers, with July highs near 27°C, to cold winters, when February lows sit around -11°C (a swing of about 38°C across the year). August is usually the wettest month, and Longueuil sees roughly 1211 mm of precipitation annually. Overnight lows stay below freezing across 4 months (January, February, March and December), so Longueuil sees regular winter snowfall.
Best time to visit Longueuil
The most comfortable time to visit Longueuil is usually May, June, September and October, when daytime highs sit in the pleasant 16-26°C range and the heaviest August rain is behind you.
Which forecast is most accurate in Longueuil?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 1302 cities. Lower error means a higher score. See which forecast model is most accurate in Canada, how we measure forecast accuracy, or which model each weather app uses.
Bottom line: over the last 30 days the European model has been the most accurate forecast for Longueuil, scoring 92/100 on our CheckWeather Score, ahead of the Env. Canada at 73. See the full CA accuracy scoreboard for exactly how every model is tested.
Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain — and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.